My list is pretty similar to the others...
Koenigsegg - It should have been in GT since a long time...
Porsche - Hopefully PD (and other developers) could get Porsches in their games.
Alpina - It's basically what RUF to Porsche, like say... Alpina to BMW.
Brabus - Most aftermarket Tuners in the game are Japanese cars and then couple 'murican one's...
FPV - It was in GT4 (2004/2005) and PSP (2009) but not sure why it got removed in GT5 and 6. Also Aussie cars are quite lacking in GT6.
HSV - Aussie Cars are quite lacking in GT6 and all of them are outdated.
Hennessey Performance Engineering - especially for cars like Venom GT.
Oldsmobile - I think we need more Classic Muscle & Pony Cars.
GMC - For vehicles like Typhoon and Syclone.
Jeep - For off-Roading jeeps like Wrangler and High performance SUV's like Grand Cherokee SRT.
Saab - Because we want some more Swedish cars in the game.
Skoda - Also more european's manufactures too!
Rolls Royce - I think we need some Luxury "Sport" coupe cars....same story with Bentley...
Kia - Both Kia and Hyundai started to Step up their cars in the last couple years...also i think maybe add cars like Cerato Koup or Soul.
Vector - Gran Turismo 2 Anyone?
Venturi Automobiles - Same as Above...
AMC - Similar to what i said on Oldsmobile above...
W Motors - Lykan Hypersport
Noble - M600 anyone?
De Tomaso - Pantera and Mangusta.
I'm pretty sure there's much more that i forgot to mention.
Koenigsegg - It should have been in GT since a long time...
Porsche - Hopefully PD (and other developers) could get Porsches in their games.
Alpina - It's basically what RUF to Porsche, like say... Alpina to BMW.
Brabus - Most aftermarket Tuners in the game are Japanese cars and then couple 'murican one's...
FPV - It was in GT4 (2004/2005) and PSP (2009) but not sure why it got removed in GT5 and 6. Also Aussie cars are quite lacking in GT6.
HSV - Aussie Cars are quite lacking in GT6 and all of them are outdated.
Hennessey Performance Engineering - especially for cars like Venom GT.
Oldsmobile - I think we need more Classic Muscle & Pony Cars.
GMC - For vehicles like Typhoon and Syclone.
Jeep - For off-Roading jeeps like Wrangler and High performance SUV's like Grand Cherokee SRT.
Saab - Because we want some more Swedish cars in the game.
Skoda - Also more european's manufactures too!
Rolls Royce - I think we need some Luxury "Sport" coupe cars....same story with Bentley...
Kia - Both Kia and Hyundai started to Step up their cars in the last couple years...also i think maybe add cars like Cerato Koup or Soul.
Vector - Gran Turismo 2 Anyone?
Venturi Automobiles - Same as Above...
AMC - Similar to what i said on Oldsmobile above...
W Motors - Lykan Hypersport
Noble - M600 anyone?
De Tomaso - Pantera and Mangusta.
I'm pretty sure there's much more that i forgot to mention.